WO2014115296A1 - Heat treatment method for metal member and heat-treated metal member - Google Patents
Heat treatment method for metal member and heat-treated metal member Download PDFInfo
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- WO2014115296A1 WO2014115296A1 PCT/JP2013/051570 JP2013051570W WO2014115296A1 WO 2014115296 A1 WO2014115296 A1 WO 2014115296A1 JP 2013051570 W JP2013051570 W JP 2013051570W WO 2014115296 A1 WO2014115296 A1 WO 2014115296A1
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- cooling
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- metal member
- processing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/08—Modifying the physical properties of iron or steel by deformation by cold working of the surface by burnishing or the like
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2261/00—Machining or cutting being involved
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H2055/325—Friction members characterized by roughness or hardness of friction surface
Definitions
- the present invention relates to a heat treatment method for a metal member that is quenched or quenched by mist cooling that cools a metal workpiece with sprayed cooling water, and a metal member that has been heat treated using the heat treatment method. is there.
- mist cooling for cooling the workpiece with cooling water sprayed in the form of mist has been performed.
- mist cooling since the work is cooled by utilizing the action of sensible heat and latent heat when the sprayed cooling water collides with the work, a higher cooling effect can be obtained as compared with the conventional cooling method.
- the invention described in Japanese Patent Application Laid-Open No. 2011-12221 relates to a mist cooling method in which a cooling mist is injected onto a heated metal workpiece to cool the workpiece.
- the first nozzle for injecting the cooling mist and the cooling mist having a particle diameter smaller than the particle diameter of the cooling mist injected from the first nozzle.
- Two types of nozzles, the second nozzle for injecting the liquid are used to cool the workpiece.
- the heat-treated workpiece can be cooled at a wide range of cooling rates. For example, rapid cooling is performed in a certain period and other periods are performed. However, it is said that uniform and gentle cooling can be performed in order to prevent the occurrence of distortion and bending.
- the cooling rate can be controlled by adjusting the injection amount and the injection time of the cooling water. Further, as in the invention described in the above Japanese Patent Application Laid-Open No. 2011-12211, by using different types of nozzles having different nozzle diameters, or by adjusting the number, position, injection angle, or injection pressure of the nozzles. The cooling rate can be controlled to perform appropriate cooling according to the size and shape of the workpiece.
- the sizes and shapes of the workpieces that are actually manufactured are various, and it has been difficult to perform uniform and appropriate cooling by mist cooling corresponding to such various workpieces.
- mist cooling a workpiece having a shape and a calorie distribution as shown in FIG. 9, as shown in FIG.
- uniform and appropriate cooling can be performed corresponding to the heat distribution of the workpiece.
- each time the shape or type of the workpiece is changed it is necessary to adjust the nozzles corresponding to the new workpiece, and it is difficult to perform mist cooling appropriately for all the various workpieces.
- the present invention has been made by paying attention to the above technical problems, and can easily control the cooling rate corresponding to various workpieces, and can be baked by mist cooling that can perform uniform and appropriate cooling. It is an object of the present invention to provide a heat treatment method for a metal member that is subjected to insertion or rapid cooling, and a metal member that has been heat treated using the heat treatment method.
- the present invention provides a heating process for heating a metal workpiece under a predetermined heating condition, and a mist cooling that performs cooling by spraying cooling water after the heating process.
- the heat treatment method for a metal member having a cooling step of cooling the workpiece under the cooling conditions of the workpiece the workpiece according to the heat distribution of the workpiece when heated in the heating step before the heating step It has the surface processing process of adjusting and processing the surface roughness of this, It is the heat processing method of the metal members characterized by the above-mentioned.
- the surface processing step in the present invention includes a step of processing the workpiece so that the surface roughness becomes smaller as the heat amount of the heat distribution becomes larger.
- the cooling step in the present invention includes a step of spraying the cooling water so that an average particle diameter of spray droplets in the mist cooling is in a range of 0.1 mm to 2.0 mm.
- the workpiece in the present invention includes steel automobile parts.
- the workpiece according to the present invention includes constituent members constituting a pulley of a belt type continuously variable transmission.
- the surface processing step in the present invention includes a step of processing the workpiece by machining.
- the surface processing step in the present invention includes a step of processing the workpiece by at least one of shot peening, shot blasting, sand blasting, grinding, or polishing.
- the present invention relates to a metal member that has been heated under a predetermined heating condition and then subjected to a heat treatment for cooling under a predetermined cooling condition by mist cooling in which cooling water is sprayed for cooling.
- a heat-treated metal member characterized in that the surface roughness is adjusted according to the heat distribution when heated under conditions, and the heat treatment is performed after the processing. .
- the metal member according to the present invention may be configured such that the surface roughness is reduced so that the surface roughness becomes smaller as the heat amount of the heat distribution increases.
- the metal member in the present invention includes steel automobile parts.
- the said metal member in this invention contains the steel member which comprises the pulley of a belt-type continuously variable transmission.
- the surface of the metal workpiece is heated in the surface roughness adjustment step before the predetermined heat treatment is performed in the heating step and the cooling step by mist cooling.
- the surface roughness is adjusted in accordance with the amount of heat in the heat amount distribution when heated at.
- the processing target surface roughness is set to a smaller value in the portion where the heat quantity distribution at the time of heating in the heating process is larger.
- the cooling rate when the work is subjected to mist cooling can be controlled by adjusting the surface roughness of the work to be heat-treated. For example, at locations where the amount of heat in the heat distribution when the workpiece is heated is high, the cooling rate during mist cooling is increased by processing the surface of the workpiece so that the surface roughness is reduced in the previous process of heat treatment. can do. On the other hand, in the part where the heat quantity of the heat quantity distribution is small, the cooling rate at the time of mist cooling can be slowed by processing the surface of the workpiece so that the surface roughness becomes large in the pre-process of heat treatment.
- the cooling rate during the subsequent mist cooling can be controlled. That is, the cooling rate of the workpiece can be controlled without adjusting the position and quantity of nozzles for mist cooling or the cooling water injection state on the cooling equipment side.
- the cooling rate of the workpiece can be controlled without adjusting the position and quantity of nozzles for mist cooling or the cooling water injection state on the cooling equipment side.
- transformation by heat processing can be manufactured by implementing appropriate heat processing as mentioned above. As a result, the finishing process after the heat treatment can be omitted or simplified, and the manufacturing cost of the metal member can be greatly reduced.
- the workpiece surface in the surface machining process can be easily adjusted by adjusting the surface roughness of the workpiece, for example, by machining such as lathe machining or milling.
- the surface roughness of the workpiece can be easily adjusted and processed by shot peening, shot blasting, sand blasting, grinding, polishing, or the like.
- the surface of the metal member is processed with the surface roughness adjusted according to the heat distribution when heated during the heat treatment.
- the heat processing is implemented after the process.
- the cooling rate increases as the surface roughness of the workpiece decreases as shown in FIG.
- a portion having a large calorific value in a calorie distribution when a metal member is heated is processed so that the surface roughness is small, whereby the cooling rate at the time of mist cooling can be increased.
- the cooling rate at the time of mist cooling can be slowed by processing the portion where the heat amount of the heat distribution is small so that the surface roughness is increased.
- the surface roughness of each part of the metal member is adjusted and processed according to the heat distribution when the heat treatment is performed.
- the cooling rate at the time of mist cooling in the heat treatment can be controlled. That is, the metal member can be easily and uniformly cooled by mist cooling without adjusting the position and quantity of the nozzles for mist cooling or the cooling water injection state such as the injection state of the cooling water. And by performing appropriate heat processing as mentioned above, the metal member with few distortion and deformation
- FIG. 6 The result of comparing the amount of deformation of the workpiece when the workpiece is mist cooled by applying the heat treatment method according to the present invention and the amount of deformation of the workpiece when the workpiece is mist cooled without applying the heat treatment method according to the present invention It is a graph for demonstrating.
- FIG. 1 An example of a metal member targeted by the present invention is shown in FIG.
- a workpiece 1 shown in FIG. 1 is a metal member in the present invention.
- the work 1 is a steel automobile part, specifically, a steel member that constitutes a pulley of a belt type continuously variable transmission mounted on the automobile.
- the workpiece 1 shown in FIG. 1 is a member constituting a fixed sheave in the pulley of the belt type continuously variable transmission.
- the workpiece 1 is composed of a fixed sheave portion 2 and a shaft portion 3 that is formed integrally with the fixed sheave portion 2 and serves as a pulley shaft.
- the fixed sheave portion 2 is formed with a sheave surface 2a that forms a winding groove of a transmission belt (not shown) facing the sheave surface of a disk-shaped movable sheave (not shown). Therefore, a pulley of a belt-type continuously variable transmission is configured by inserting a movable sheave movably in the axial direction with respect to the shaft portion 3 of the work 1 and facing the fixed sheave portion 3. .
- the workpiece 1 is formed into a shape as shown in FIG. 1 by, for example, forging, machining such as lathe processing and counterboring.
- machining such as lathe processing and counterboring.
- the outer peripheral surface of the work 1 is formed into a desired shape and size by lathe processing.
- the axial center part of the axial part 3 is counterbored.
- the workpiece 1 is subjected to heat treatment for cooling under a predetermined cooling condition after being heated under a predetermined heating condition such as carburizing, nitriding, or carbonitriding. And in this invention, when cooling the heated workpiece
- the metal member in this invention can make into object all the metal members in which the heat processing cooled by mist cooling is implemented.
- the steel member as shown in FIG. 1 for example, cast iron, aluminum alloy, or other non-ferrous metal members can be targeted.
- the workpiece 1 is processed by adjusting the surface roughness of each part of the work 1 in order to control the cooling rate of each part of the work 1 and uniformly cool the whole part of the work 1 during the mist cooling in the heat treatment.
- the surface roughness of each part of the work 1 is set according to the amount of heat of the heat amount distribution when heated in the heat treatment. That is, the surface of the workpiece 1 is processed so that the surface roughness becomes smaller as the heat quantity of the heat quantity distribution when heated in the heat treatment becomes larger.
- Such surface processing of the workpiece 1 is performed before the heat treatment for the workpiece 1. Then, as described above, the outer peripheral surface of the work 1 is machined by, for example, lathe processing so as to have a surface roughness set according to the heat distribution of each part of the work 1.
- the surface of the workpiece 1 has a flat portion, it can be processed to have a desired surface roughness by, for example, milling.
- other surface processing methods such as shot peening processing, shot blasting processing, sand blasting processing, grinding processing, and polishing processing are also used as described above. It can also be processed to have a desired surface roughness.
- the work 1 shown in FIG. 1 has a heat distribution when heated in the heat treatment as shown in FIG. That is, when the workpiece 1 is heated in the heat treatment, the intermediate portion 3b of the thick shaft portion 3 and the fixed sheave portion 2 connected to the fixed sheave portion 2 and the shaft portion 3 are formed.
- the amount of heat in the heat amount distribution is relatively large at the connecting portion 2c, the connecting portion 3c of the shaft portion 3, and the like.
- the amount of heat in the heat amount distribution becomes relatively small at the outer peripheral end 2b of the fixed sheave portion 2 which is thin, the tip 3a of the shaft portion 3, and the like.
- This heat quantity distribution can be obtained by actually measuring the temperature of each part of the work 1 when the work 1 is actually heated. Alternatively, it can be estimated and obtained by simulation using a computer.
- work 1 is each set according to the calorie
- the intermediate portion 3b having a large heat quantity in the heat quantity distribution is processed with an arithmetic average roughness Ra of 0.8 ⁇ m as a target value.
- the connecting portion 3c is processed with an arithmetic average roughness Ra of 1.6 ⁇ m as a target value.
- the connection part 2c is processed by 2.0 micrometers as a target value by arithmetic mean roughness Ra.
- the tip 3a having a small heat quantity in the heat quantity distribution is processed with an arithmetic average roughness Ra of 3.2 ⁇ m as a target value.
- the outer peripheral end 2b is processed with an arithmetic average roughness Ra of 6.3 ⁇ m as a target value.
- the surface roughness of each part of the workpiece 1 is adjusted according to the heat distribution when the workpiece 1 is heated in the heat treatment,
- the surface of the workpiece 1 is processed. That is, the surface of the workpiece 1 is processed so that the surface roughness becomes smaller as the amount of heat in the heat distribution when the workpiece 1 is heated is larger.
- the cooling rate increases as the surface roughness of the metal member is smaller. It has been found that more heat is cooled within a predetermined cooling time. The graph of FIG.
- FIG. 11 shows the measurement result of the cooling time when a test piece whose surface roughness is adjusted using chrome steel as a material is cooled by mist cooling.
- mist cooling when the cooling water is sprayed so that the average particle diameter of the spray droplets of the cooling water is within the range of 0.1 mm to 2.0 mm, as shown in FIG. It has been found that a sufficient cooling time measurement result can be obtained.
- the workpiece 1 when the workpiece 1 is mist-cooled in the heat treatment, the workpiece 1 is adjusted so that the cooling rate becomes faster as the heat distribution of the workpiece 1 is larger. Therefore, when the workpiece 1 is mist-cooled for quenching or rapid cooling in heat treatment, the entire workpiece 1 is cooled substantially uniformly. As a result, this workpiece 1 can be subjected to good heat treatment with less distortion and deformation.
- the heat treatment method in the present invention is, for example, a heat treatment method for carburizing a steel workpiece 1. And in the heat processing method in this invention, mist cooling is implemented in the hardening (cooling) process after a heating process. Furthermore, in the heat treatment method according to the present invention, in addition to the heating step and the quenching step, the heat distribution when the workpiece 1 is heated in the heating step before the heat treatment performed in the heating step and the quenching step. The surface roughness process of adjusting the surface roughness of the workpiece 1 according to the above and machining the surface of the workpiece 1 is provided. Specifically, as shown in FIG.
- the heat treatment method according to the present invention comprises a forming step (process P0), a surface processing step (process P1), a heating step (process P2), and a cooling (quenching) step in the order of steps. (Process P3) and the finishing process (Process P4).
- the material steel is forged to form the workpiece 1 material.
- rough processing by deburring, lathe processing or the like generated by forging is performed. It should be noted that these deburring and roughing processes can be performed collectively in the next surface processing step.
- the surface roughness of the workpiece 1 is adjusted and processed according to the heat distribution when the workpiece 1 is heated in the next heating step.
- the heat distribution when the workpiece 1 is heated is obtained in advance by actual measurement, simulation using a computer, or the like.
- the surface roughness of each part of the workpiece 1 is set as a processing target when the surface of the workpiece 1 is processed.
- work 1 is processed so that the set surface roughness may be implement
- the lathe machining or the like of the work 1 is performed so that the surface roughness becomes smaller as the heat amount of the heat distribution when the work 1 is heated is larger. The surface is processed.
- the cooling rate increases as the surface roughness of the workpiece 1 decreases. This is considered to be influenced by the Leidenfrost phenomenon.
- Leidenfrost phenomenon when a liquid droplet touches a high-temperature solid surface heated to a temperature higher than the boiling point of the liquid, a vapor layer is formed between the solid surface and the droplet, which inhibits the evaporation of the droplet. It is a phenomenon.
- the portion where the heat amount of the heat amount distribution when the workpiece 1 is heated is processed so that the surface roughness becomes small, so that the cooling at the time of mist cooling is performed.
- Speed can be increased.
- the cooling rate at the time of mist cooling can be slowed by processing the portion where the heat amount of the heat distribution is small so that the surface roughness is increased.
- the workpiece 1 is heated under a predetermined heating condition and a predetermined gas atmosphere for carburizing, and the state is maintained for a predetermined processing time.
- a predetermined heating condition and a predetermined gas atmosphere for carburizing for carburizing, and the state is maintained for a predetermined processing time.
- the workpiece 1 is heated to a carburizing temperature of about 900 to 950 ° C. in a carburizing gas atmosphere in which propane gas or methane gas is modified.
- the workpiece 1 carburized in the steam heating step is quenched.
- gas cooling is widely performed for quenching after carburizing, but in the heat treatment method according to the present invention, mist cooling is performed.
- mist cooling has a higher cooling effect than gas cooling, but it is difficult to adjust cooling equipment in order to set appropriate cooling conditions for all kinds of workpieces. there were. Therefore, in the present invention, the surface processing step is provided as described above before the heat treatment in which the mist cooling is performed. By adjusting the surface roughness of each part of the work 1 in the surface processing step, the cooling rate of each part of the work 1 at the time of subsequent mist cooling can be controlled, and the whole work 1 can be uniformly cooled by mist cooling. I am doing so.
- the cooling rate of each part of the work 1 in the cooling process can be controlled by adjusting the surface roughness of the work 1 itself without adjusting on the cooling equipment side. . Therefore, in the conventional method, as shown in FIG. 10 described above, adjustment on the cooling equipment side is necessary to control the cooling rate of the workpiece, whereas in the heat treatment method according to the present invention, the cooling equipment is used.
- the injection nozzles may remain in a simple arrangement as shown in FIG. 3, for example. Further, the injection amount and the injection pressure of the cooling water may be set to be constant.
- FIG. 4 shows the measurement results of the cooling time of each part of the work 1 when the mist cooling is performed by adjusting the surface roughness of the work 1 as described above to control the cooling rate.
- FIG. 5 shows the measurement results of the cooling time of each part of the work 1 when mist cooling is performed without controlling the cooling rate.
- the temperature measurement point a the outer peripheral end portion of the fixed sheave portion 2
- the cooling rate is relatively fast at b (intermediate portion of the fixed sheave portion 2), whereas the cooling rate is slow at the temperature measurement point c (inner peripheral end portion of the fixed sheave portion 2). Therefore, in this case, it can be seen that the cooling rate of each part of the work 1 during mist cooling varies greatly.
- the temperature measurement point a when the surface roughness of the workpiece 1 is adjusted by the heat treatment method of the present invention and the cooling rate is controlled and mist cooling is performed, the temperature measurement point a, the temperature measurement point There is no significant difference between b and the temperature measurement point c (the inner peripheral end portion of the fixed sheave portion 2). That is, as shown in FIG. 6, the surface roughness of the workpiece 1 is adjusted without adjusting the surface roughness of the workpiece 1 and compared with the variation in the cooling rate when the mist cooling is performed without controlling the cooling rate. And it turns out that the dispersion
- the heat treatment method according to the present invention by adjusting the surface roughness of the workpiece 1 to control the cooling rate at the time of mist cooling, the variation in the cooling rate among the parts of the workpiece 1 is small.
- the whole can be cooled uniformly.
- work 1 can be cooled uniformly at the time of mist cooling, ie, the quenching in heat processing, as shown in FIG. 7, generation
- the finishing process of the workpiece 1 after carburizing and quenching is performed as described above. For example, removal of the scale generated in the previous process and machining for ensuring the finished dimensions are performed.
- the entire work 1 can be uniformly cooled during the mist cooling in the heat treatment, and the work 1 with less distortion and deformation due to the heat treatment can be manufactured.
- the finishing process in this finishing process can also be skipped. Or the machining allowance at the time of finishing is reduced compared with the conventional case, and the cost required for finishing can be reduced accordingly.
- FIG. 8 As described above, the effect of cost reduction when the workpiece 1 is manufactured by applying the heat treatment method of the present invention is shown in FIG. As shown in FIG. 8, when the quenching is performed by mist cooling to which the heat treatment method of the present invention is applied, the workpiece 1 is manufactured by the conventional method in which quenching is performed by gas cooling. The manufacturing cost can be greatly reduced.
- the work 1 is subjected to mist cooling.
- the cooling rate can be controlled. That is, in the portion where the heat quantity of the heat distribution when the work 1 is heated for the heat treatment is large, the surface of the work 1 is processed so that the surface roughness becomes small in the previous process of the heat treatment. The cooling rate can be increased. On the other hand, in the portion where the heat quantity of the heat distribution is small, the cooling rate at the time of mist cooling can be slowed by processing the surface of the workpiece 1 so that the surface roughness is increased in the previous process of heat treatment. .
- the cooling rate of the workpiece 1 can be controlled without adjusting on the cooling facility side such as the position and quantity of nozzles for mist cooling or the injection state of cooling water.
- the cooling facility side such as the position and quantity of nozzles for mist cooling or the injection state of cooling water.
- uniform and appropriate cooling can be easily performed by mist cooling without adjusting or changing the cooling equipment.
- work 1 is cooled uniformly by mist cooling, and the workpiece
- the finishing process after the heat treatment can be omitted or simplified, and the manufacturing cost of the workpiece 1, that is, the metal member in the present invention can be greatly reduced.
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Abstract
Description
Claims (11)
- 所定の加熱条件の下で金属製のワークを加熱する加熱工程と、前記加熱工程の後に、冷却水を噴霧して冷却を行うミスト冷却によって所定の冷却条件の下で前記ワークを冷却する冷却工程とを有する金属製部材の熱処理方法において、
前記加熱工程の前に、前記加熱工程で加熱される際の前記ワークの熱量分布に応じて前記ワークの表面粗さを調整して加工する表面加工工程を有していることを特徴とする金属製部材の熱処理方法。 A heating step for heating a metal workpiece under a predetermined heating condition, and a cooling step for cooling the workpiece under a predetermined cooling condition by mist cooling in which cooling is performed by spraying cooling water after the heating step. In a heat treatment method of a metal member having
Before the heating step, a metal having a surface processing step of adjusting and processing the surface roughness of the workpiece according to the heat distribution of the workpiece when heated in the heating step A method for heat treatment of a manufactured member. - 前記表面加工工程は、前記熱量分布の熱量が大きい箇所ほど前記表面粗さが小さくなるように前記ワークを加工する工程を含むことを特徴とする請求項1に記載の金属製部材の熱処理方法。 2. The method for heat-treating a metal member according to claim 1, wherein the surface processing step includes a step of processing the workpiece so that the surface roughness becomes smaller as the heat amount of the heat distribution increases.
- 前記冷却工程は、前記ミスト冷却における噴霧液滴の平均粒径が0.1mmから2.0mmの範囲内となるように前記冷却水を噴霧させる工程を含むことを特徴とする請求項1または2に記載の金属製部材の熱処理方法。 The cooling step includes a step of spraying the cooling water so that an average particle diameter of spray droplets in the mist cooling is in a range of 0.1 mm to 2.0 mm. The heat processing method of the metal members as described in any one of.
- 前記ワークは、鋼製の自動車部品を含むことを特徴とする請求項1から3のいずれかに記載の金属製部材の熱処理方法。 The heat treatment method for a metal member according to any one of claims 1 to 3, wherein the workpiece includes a steel automobile part.
- 前記ワークは、ベルト式無段変速機のプーリを構成する鋼製部材を含むことを特徴とする請求項4に記載の金属製部材の熱処理方法。 5. The heat treatment method for a metal member according to claim 4, wherein the workpiece includes a steel member constituting a pulley of a belt type continuously variable transmission.
- 前記表面加工工程は、機械加工によって前記ワークを加工する工程を含むことを特徴とする請求項1から5のいずれかに記載の金属製部材の熱処理方法。 The heat treatment method for a metal member according to any one of claims 1 to 5, wherein the surface processing step includes a step of processing the workpiece by machining.
- 前記表面加工工程は、ショットピーニング加工、ショットブラスト加工、サンドブラスト加工、研削加工、または研磨加工の少なくともいずれかによって前記ワークを加工する工程を含むことを特徴とする請求項1から5のいずれかに記載の金属製部材の熱処理方法。 6. The surface processing step includes a step of processing the workpiece by at least one of shot peening processing, shot blast processing, sand blast processing, grinding processing, or polishing processing. The heat processing method of the metal member of description.
- 所定の加熱条件の下で加熱した後に、冷却水を噴霧して冷却を行うミスト冷却によって所定の冷却条件の下で冷却する熱処理が施された金属製部材において、
前記加熱条件の下で加熱される際の熱量分布に応じて表面粗さが調整されて加工されているとともに、その加工後に前記熱処理が施されていることを特徴とする熱処理された金属製部材。 In a metal member that has been subjected to a heat treatment that is cooled under a predetermined cooling condition by mist cooling that is performed by spraying cooling water after being heated under a predetermined heating condition.
A heat-treated metal member characterized in that the surface roughness is adjusted according to the heat quantity distribution when heated under the heating conditions, and the heat treatment is performed after the processing. . - 前記金属製部材は、前記熱量分布の熱量が大きい箇所ほど前記表面粗さが小さくなるように表面加工されていることを特徴とする請求項8に記載の熱処理された金属製部材。 9. The heat-treated metal member according to claim 8, wherein the metal member is surface-treated so that the surface roughness becomes smaller as the heat amount of the heat distribution increases.
- 前記金属製部材は、鋼製の自動車部品を含むことを特徴とする請求項8または9に記載の熱処理された金属製部材。 10. The heat-treated metal member according to claim 8 or 9, wherein the metal member includes a steel automobile part.
- 前記金属製部材は、ベルト式無段変速機のプーリを構成する鋼製部材を含むことを特徴とする請求項10に記載の熱処理された金属製部材。 The heat-treated metal member according to claim 10, wherein the metal member includes a steel member constituting a pulley of a belt type continuously variable transmission.
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US14/763,365 US20150361516A1 (en) | 2013-01-25 | 2013-01-25 | Method of heat treating metal articles and metal article treated thereby |
PCT/JP2013/051570 WO2014115296A1 (en) | 2013-01-25 | 2013-01-25 | Heat treatment method for metal member and heat-treated metal member |
CN201380071332.2A CN104937117B (en) | 2013-01-25 | 2013-01-25 | The heat treatment method of metal parts and carried out the metal parts of heat treatment |
JP2014558379A JPWO2014115296A1 (en) | 2013-01-25 | 2013-01-25 | Heat treatment method for metal member and metal member |
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Citations (2)
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JPS63149315A (en) * | 1986-12-12 | 1988-06-22 | Kawasaki Steel Corp | Cooling method for steel plate |
JP2004293635A (en) * | 2003-03-26 | 2004-10-21 | Nissan Motor Co Ltd | Belt-type continuously variable transmission and its manufacturing method |
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JPH0762497B2 (en) * | 1987-07-10 | 1995-07-05 | 日産自動車株式会社 | Gear manufacturing method |
JPH0499129A (en) * | 1990-08-07 | 1992-03-31 | Mitsubishi Materials Corp | Heat treatment of annular material |
JP2005163173A (en) * | 2003-11-14 | 2005-06-23 | Komatsu Ltd | Gear part and method of producing thereof |
CN101376956B (en) * | 2007-08-31 | 2010-12-01 | 宝山钢铁股份有限公司 | Method for controlling alloyed hot dip galvanizing steel plate coating phase structure and alloyed hot dip galvanizing steel plate |
JP4860583B2 (en) * | 2007-09-13 | 2012-01-25 | トヨタ自動車株式会社 | Pulley for continuously variable transmission and continuously variable transmission |
JP5214265B2 (en) * | 2008-02-05 | 2013-06-19 | 愛知製鋼株式会社 | Pulley for belt type CVT |
-
2013
- 2013-01-25 US US14/763,365 patent/US20150361516A1/en not_active Abandoned
- 2013-01-25 JP JP2014558379A patent/JPWO2014115296A1/en active Pending
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JPS63149315A (en) * | 1986-12-12 | 1988-06-22 | Kawasaki Steel Corp | Cooling method for steel plate |
JP2004293635A (en) * | 2003-03-26 | 2004-10-21 | Nissan Motor Co Ltd | Belt-type continuously variable transmission and its manufacturing method |
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CN104937117A (en) | 2015-09-23 |
US20150361516A1 (en) | 2015-12-17 |
JPWO2014115296A1 (en) | 2017-01-26 |
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